At 40°C, the ionic product of water, Kw , is:
Correct answer: B. 2.9×10⁻¹⁴
- A. 1.0×10⁻¹⁴
- B. 2.9×10⁻¹⁴
- C. 3.8×10⁻¹⁴
- D. 1.8×10⁻¹⁴
Explanation
The autoionization of water is an endothermic process. According to Le Chatelier's principle, increasing the temperature will shift the equilibrium to the right, increasing the concentrations of H⁺ and OH⁻. This results in a larger K value at higher temperatures; at 40°C, it is approximately 2.9×10⁻¹⁴.
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About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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